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Model java.util.Optional
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‎java/ql/src/semmle/code/java/dataflow/ExternalFlow.qll

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@@ -82,6 +82,7 @@ private module Frameworks {
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private import semmle.code.java.frameworks.guava.Guava
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private import semmle.code.java.frameworks.jackson.JacksonSerializability
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private import semmle.code.java.frameworks.JaxWS
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private import semmle.code.java.frameworks.Optional
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private import semmle.code.java.frameworks.spring.SpringHttp
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private import semmle.code.java.frameworks.spring.SpringWebClient
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private import semmle.code.java.security.ResponseSplitting

‎java/ql/src/semmle/code/java/frameworks/Optional.qll

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/** Definitions related to `java.util.Optional`. */
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import semmle.code.java.dataflow.ExternalFlow
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private class OptionalModel extends SummaryModelCsv {
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override predicate row(string s) {
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s =
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[
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"java.util;Optional;false;filter;;;Element of Argument[-1];Element of ReturnValue;value",
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"java.util;Optional;false;get;;;Element of Argument[-1];ReturnValue;value",
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"java.util;Optional;false;of;;;Argument[0];Element of ReturnValue;value",
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"java.util;Optional;false;ofNullable;;;Argument[0];Element of ReturnValue;value",
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"java.util;Optional;false;or;;;Element of Argument[-1];Element of ReturnValue;value",
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"java.util;Optional;false;orElse;;;Element of Argument[-1];ReturnValue;value",
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"java.util;Optional;false;orElse;;;Argument[0];ReturnValue;value",
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"java.util;Optional;false;orElseGet;;;Element of Argument[-1];ReturnValue;value",
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"java.util;Optional;false;orElseThrow;;;Element of Argument[-1];ReturnValue;value",
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"java.util;Optional;false;stream;;;Element of Argument[-1];Element of ReturnValue;value"
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]
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}
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}

‎java/ql/test/library-tests/optional/Test.java

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package generatedtest;
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import java.util.Optional;
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import java.util.stream.Stream;
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// Test case generated by GenerateFlowTestCase.ql
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public class Test {
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Object getElement(Optional<Object> container) { return container.get(); }
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Object getStreamElement(Stream<Object> container) { return null; /* Modelled in .ql file */ }
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Optional<Object> newWithElement(Object element) { return Optional.of(element); }
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Object source() { return null; }
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void sink(Object o) { }
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public void test() {
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{
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// "java.util;Optional;false;filter;;;Element of Argument[-1];Element of ReturnValue;value"
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Optional<Object> out = null;
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Optional<Object> in = newWithElement(source());
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out = in.filter(null);
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sink(getElement(out)); // $hasValueFlow
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}
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{
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// "java.util;Optional;false;get;;;Element of Argument[-1];ReturnValue;value"
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Object out = null;
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Optional<Object> in = newWithElement(source());
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out = in.get();
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sink(out); // $hasValueFlow
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}
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{
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// "java.util;Optional;false;of;;;Argument[0];Element of ReturnValue;value"
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Optional<Object> out = null;
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Object in = (Object)source();
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out = Optional.of(in);
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sink(getElement(out)); // $hasValueFlow
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}
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{
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// "java.util;Optional;false;ofNullable;;;Argument[0];Element of ReturnValue;value"
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Optional<Object> out = null;
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Object in = (Object)source();
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out = Optional.ofNullable(in);
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sink(getElement(out)); // $hasValueFlow
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}
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{
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// "java.util;Optional;false;or;;;Element of Argument[-1];Element of ReturnValue;value"
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Optional<Object> out = null;
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Optional<Object> in = newWithElement(source());
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out = in.or(null);
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sink(getElement(out)); // $hasValueFlow
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}
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{
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// "java.util;Optional;false;orElse;;;Argument[0];ReturnValue;value"
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Object out = null;
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Object in = (Object)source();
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Optional<Object> instance = null;
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out = instance.orElse(in);
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sink(out); // $hasValueFlow
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}
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{
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// "java.util;Optional;false;orElse;;;Element of Argument[-1];ReturnValue;value"
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Object out = null;
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Optional<Object> in = newWithElement(source());
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out = in.orElse(null);
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sink(out); // $hasValueFlow
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}
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{
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// "java.util;Optional;false;orElseGet;;;Element of Argument[-1];ReturnValue;value"
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Object out = null;
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Optional<Object> in = newWithElement(source());
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out = in.orElseGet(null);
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sink(out); // $hasValueFlow
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}
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{
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// "java.util;Optional;false;orElseThrow;;;Element of Argument[-1];ReturnValue;value"
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Object out = null;
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Optional<Object> in = newWithElement(source());
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out = in.orElseThrow(null);
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sink(out); // $hasValueFlow
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}
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{
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// "java.util;Optional;false;orElseThrow;;;Element of Argument[-1];ReturnValue;value"
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Object out = null;
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Optional<Object> in = newWithElement(source());
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out = in.orElseThrow();
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sink(out); // $hasValueFlow
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}
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{
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// "java.util;Optional;false;stream;;;Element of Argument[-1];Element of ReturnValue;value"
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Stream<Object> out = null;
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Optional<Object> in = newWithElement(source());
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out = in.stream();
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sink(getStreamElement(out)); // $hasValueFlow
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}
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}
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}

‎java/ql/test/library-tests/optional/test.expected

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‎java/ql/test/library-tests/optional/test.ql

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import java
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import semmle.code.java.dataflow.DataFlow
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import semmle.code.java.dataflow.ExternalFlow
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import semmle.code.java.dataflow.TaintTracking
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import TestUtilities.InlineExpectationsTest
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class SummaryModelTest extends SummaryModelCsv {
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override predicate row(string row) {
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row =
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[
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//"package;type;overrides;name;signature;ext;inputspec;outputspec;kind",
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"generatedtest;Test;false;getStreamElement;;;Element of Argument[0];ReturnValue;value"
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]
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}
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}
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class ValueFlowConf extends DataFlow::Configuration {
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ValueFlowConf() { this = "qltest:valueFlowConf" }
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override predicate isSource(DataFlow::Node n) {
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n.asExpr().(MethodAccess).getMethod().hasName("source")
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}
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override predicate isSink(DataFlow::Node n) {
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n.asExpr().(Argument).getCall().getCallee().hasName("sink")
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}
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}
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class TaintFlowConf extends TaintTracking::Configuration {
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TaintFlowConf() { this = "qltest:taintFlowConf" }
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override predicate isSource(DataFlow::Node n) {
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n.asExpr().(MethodAccess).getMethod().hasName("source")
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}
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override predicate isSink(DataFlow::Node n) {
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n.asExpr().(Argument).getCall().getCallee().hasName("sink")
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}
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}
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class HasFlowTest extends InlineExpectationsTest {
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HasFlowTest() { this = "HasFlowTest" }
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override string getARelevantTag() { result = ["hasValueFlow", "hasTaintFlow"] }
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override predicate hasActualResult(Location location, string element, string tag, string value) {
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tag = "hasValueFlow" and
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exists(DataFlow::Node src, DataFlow::Node sink, ValueFlowConf conf | conf.hasFlow(src, sink) |
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sink.getLocation() = location and
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element = sink.toString() and
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value = ""
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)
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or
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tag = "hasTaintFlow" and
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exists(DataFlow::Node src, DataFlow::Node sink, TaintFlowConf conf |
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conf.hasFlow(src, sink) and not any(ValueFlowConf c).hasFlow(src, sink)
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|
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sink.getLocation() = location and
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element = sink.toString() and
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value = ""
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)
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}
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}

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